code: def __init__(
      self,
      keys,
      warn_empty=True,
      important=default_important,
      essential=None,
  ):
      self.keys = keys
      self.warn_empty = warn_empty
      self.important = important
      self.essential = essential
      if self.essential is None:
          self.essential = []
  
file_path: pytorch-metric-learning/src/pytorch_metric_learning/utils/key_checker.py
imports: from .None import common_functions
label_desc: Use image node_id 1 to create a new KeyChecker object  with example: obj = KeyChecker(keys, warn_empty, important, essential)